The value of a machine depreciates at 10% per annum. If the current value of the machine is Rs. 81,000, what was the value of the machine two years ago?

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The value of a machine depreciates at 10% per annum. If the current value of the machine is Rs. 81,000, what was the value of the machine two years ago?

ARs. 99,000

BRs. 1,00,000

CRs. 1,19,000

DRs. 1,08,000

rahul ? Jan 21 '2020 at 21:5

Correct answer is: Rs. 1,00,000

Explanation:

Value of machinery
1 year ago
$\frac{81,000}{90} \times 100 = 90,000$

2 year ago
$\frac{90,000}{90} \times 100 = 1,00,000$

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Find the third proportional to 16 and 36.

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Find the third proportional to 16 and 36.

A121

B81

C72

D144

rahul ? Jan 20 '2020 at 19:44

Correct answer is: 81

Explanation:

If C is the third proportional to A and B, then $\frac{A}{B} = \frac{B}{C}$

If x is the third proportional to 16 and 36, then $\frac{16}{36} = \frac{36}{x}$

$=> \frac{4}{9} = \frac{36}{x}$

$=> x = 36 \times \frac{9}{4}$

$=> x = 9 \times 9$

$=> x = 81$

Hence, The third proportional to 16 and 36 is 81.

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Narendra is younger than Rahul by 7 years. If the ratio of their ages is 2:3, what is the current age of Narendra and Rahul?

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Narendra is younger than Rahul by 7 years. If the ratio of their ages is 2:3, what is the current age of Narendra and Rahul?

A14 and 21 years

B16 and 24 years

C18 and 27 years

D20 and 30 years

rahul ? Jan 20 '2020 at 12:42

Correct answer is: 14 and 21 years

Explanation:

If Rahul age is x, then Narendra age is x-7,
so $\frac{(x-7)}{x} = \frac{2}{3}$
$=> 3x-21 = 2x$
$=> x = 21$

So Narendra age is $21 - 7 = 14$

Rahul age is  $21$

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After 20 years, Priya's age will be 5 times of what her age was four years back. What is the current age of Priya?

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After 20 years, Priya's age will be 5 times of what her age was four years back. What is the current age of Priya?

A40 years

B10 years

C20 years

D15 years

rahul ? Jan 20 '2020 at 12:47

Correct answer is: 10 years

Explanation:

Let Priya's present age be  x years.

Priya's age after 20 years = (x + 20) years.

Priya's age 4 years back = (x - 4) years

Then ATQ, 

x + 20 = 5 (x - 4)

x + 20 = 5x - 20

=> 4x = 40

=> x = 10 

Hence, Priya's present age = x = 10 years.

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What is the name of the first "cloned" sheep?

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What is the name of the first "cloned" sheep?

ADaisy

BDolly

CBunny

DCandy

rahul ? Jan 19 '2020 at 18:26

Correct answer is: Dolly

Explanation:

Dolly the Sheep

Dolly the Sheep. Dolly (July 5, 1996 - February 14, 2003), a ewe, was the first mammal to have been successfully cloned from an adult cell. She was cloned at the Roslin Institute in Midlothian, Scotland, and lived there until her death when she was six years old.

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